The Effect of FRCA and WPSA on the Strength Properties of Foamed Concrete Siti Shahidah Sharipudin 1 , Ahmad Ruslan Mohd Ridzuan 1 , Hamidah Mohd Saman 1 1 Institute for Infrastructure Engineering and Sustainable Management (IIESM), Faculty of Civil Engineering, Universiti Teknologi Mara 40450 Shah Alam, Malaysia Email address: [email protected] ABSTRACT In view of the escalating environmental problems faced in this millennium with consideration to the rapid depletion of natural resources, the use of by-products or waste materials from different industries are highly desirable. One such alternative is waste paper sludge ash (WPSA), a local by-product produced abundantly by the paper newsprint industry. It has been observed through previous studies that WPSA possesses pozzolanic characteristics in enhancing concrete properties. On the other hand, progressive development in the construction sector recently has contributed as the main producer of construction wastes, particularly concrete wastes. Therefore, the present paper investigates the strength development of lightweight foamed concrete produced with various replacements level of WPSA and ultrafine recycled concrete aggregate (FRCA) to the cement and sand content respectively. The cube specimens were casted in size 100 mm x 100 mm x 100 mm and water cured. The compressive strengths were evaluated at 3, 7, 28 and 60 days. The results of this study showed that the inclusion of WPSA and FRCA have significant influence on the development of strength properties of foamed concrete. Keyword: waste materials, waste paper sludge ash, ultrafine recycled concrete aggregate, foamed concrete, compressive strengths INTRODUCTION Concrete is one of the oldest manufactured construction material that most widely used in construction sectors all over the world until today. Recently, tremendous research in area of concrete technology has contributed in production of various types of concrete to fulfill the current construction demand for better concrete performance which are high strength, lightweight, high toughness, durable and others. Consequently, one of the concrete that having unique characteristics and becoming famous in the modern era is foamed concrete due to it’s lightness and versatility. This innovative lightweight concrete is produced in numerous established methods for the use of construction application in many countries. Foamed concrete is basically envisaged as an insulation material because of its low weight (Jones & McCarthy, 2005a). However, there has been renewed interest in view of its savings in material and possibility for utilization of wastes (Lee & Hung, 2005). Various types of wastes or industrial by-product with recycled materials are potential use in foamed concrete becomes an increasingly attractive option in order to leave an enormous environmental footprint on Planet Earth which associated with carbon dioxide emission and wastes disposal problem. Furthermore, the world’s yearly consumption of Portland cement rose from 2 million to 1.3 billion tons, where for every one ton of cement produced, 1 to 1.25 ton of CO 2 is released into the atmosphere with 4GJ energy per tone is required (Habeeb & Mahmud, 2009; Malhotra, 1998, 2002). In addition, in manufacturing one ton of cement, 1.6 tons of natural resources are consumed such as limestone, clay, and coal, results in extensive deforestation and top- soil loss. Currently, the use of replacement materials in Portland cement has attracted much attention. Numerous papers have been proven the applications of wastes and supplementary cementing materials such as fly ash, ground granulated blast furnace slag (GGBS), silica fume (SF), and palm oil fuel ash (POFA) as partial cement replacement are appropriated for foamed concrete construction because of its pozzolanic nature. In blended cements, the replacement JURNAL INTELEK VOLUME 6, ISSUE 1 105
The Effect of FRCA and WPSA on the Strength Properties of Foamed Concrete
Apr 22, 2023
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